Kuresu writes:
you know those mountains on the west coast of california
Just a smidgen, having gone to HS and JC there, where I studied biology and geology.
If you want to know where all that marine mud went, go walking around the Morro Bay area after a good rain, chances are it is a few inches thick sticking to the soles of your shoes.
The coast range has one of the most complex jumbles of geologic formations in the world, which is testimony to its history as a plate boundary and an accretion zone. Sure glad field camp was in the Zuni Mountains of New Mexico instead of the Coast Range or I'd probably still be there trying to get that 6 units of credit.
At any rate, what previous posters have said is true, much of the ocean sediment is now continent and/or compressed beyond any YECs imagination.